Energy and temperature dependences of ion-induced electron emission from polycrystalline graphite

✍ Scribed by V.S. Avilkina; N.N. Andrianova; A.M. Borisov; E.S. Mashkova; E.S. Parilis

• Book ID: 104069928
• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 325 KB
• Volume: 269
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2010.12.030

✦ Synopsis

The dependences of the yield c of ion-induced kinetic electron emission from polycrystalline graphite on ion energy E were measured under high-fluence Ar + and N þ 2 ion irradiation in energy range 6-30 keV from room temperature to 400 °C. It has been observed that the step-like pattern of temperature dependence c(T) at the dynamic radiation damage annealing temperature T a is gradually transformed with decreasing ion energy until c virtually ceases to depend on temperature. The experimentally obtained energy dependence of the ratio c(T > T a )/c(T < T a ) has been analyzed using the theory of ion-induced kinetic electron emission. Some threshold values of the level of radiation damage m d measured in dpa under steady state of high-fluence Ar + and N þ 2 irradiation have been found. When m becomes less than a threshold value m d, the graphite lattice is virtually not disordered. It has been found that m d for Ar + ions is greater than m d for N þ 2 ions.